Centrifugal pump.



4o 7 1g. 2-is a similar v1 -'struction. Referring first to"'Fig'.

. To alt 'whom'et may concern:

UNITED s'rarns -PA'TETENT @FFIQ i3.

HULDREICH KELL'nnor rennin, GERMANY, ASSIGNOR TO GENERAL ELECTRIC'COMPANY,'A-CQBPORATION or NEW Your:

- spcmcatim I'tter's t Patented Mar. 28. 191i. 1 hppiicatioii 'fii'e'aOctolier 9,

1510s. Serial no. 456,980.

' .Be it known that I, net ieii mmk, a citizen of Switzerland, 'residng' useful Improvements CentrifugalPunips, of which the followingis aspecification. Y

throw out through a'rapidlyrevolying circular runner and delivered to;tionarydiifuseror conducting ringfj" The"centrifugalaction isjiiitensified by admitting a liquid theair or gas to. be pumped'is'eiitrainedbe tween pellet-s or pistons ofwater and car ried forciblyoiit through the impelleraiid' diffuser. In a p nup of this type it iswell known that. the 'compressin jaction 'is .in'-

creased by decreasing the size of-the'oonduits outwardly as they passthrough the difi'user or conducting ring. If this'constrictionextendsthroughout the'entire conduit, the particles in a piston of the drivingmedium must 1" constantly changing position as it .moves along theconduit. This shifting ofeourse entails great friction losses in saidpiston, and theenergy formed into friction is lost. The object of thepresent invention is to reduce as -much' as possible'the aforesaidshifting of the particles and the consequent friction losses, byconfining the constriction of theconduits to their initial portions,leavg them to continue thereafterat a'consta'nt size.

In the accompanying drawing, Figure 1 is a longitudinal section of. aportion of a conducting ringembodying my, invention; andthus trans- 1,the conduits "1 which are found in the conducting ring 2 fona portion oftheir length. Calculation and eiiperiment demonstrate that the mostfavorable point for the minimum constriction is' about midway of thelength of the conduit, as at 4. From thereon to the exits 5 the conduitspreserve a substantially uni- ,form cross section, being preferablystraight,

as shown. In these' conduits the water pistons 6 grow'eontinuously'smaller in cross ,liB-fifliM-L- German Y haveinvcnte'dfcerta n' newand on? of a modified 'conare constricted ortapered from their en-- ,trances 3 .on the inside of the ring outwardlysection and greater in length as they move froznihe entrance'3 to thepoint of greatest 'c ':nstriction, the spaces between them becomingsmaller. The gas pistons 7 confined between the water pistons decreasein volume, because not only'their cross section but their axial lengtheon U ntly grows less. In progressing"alongtne fiiniform portion of theconduit to its exit fig-the-water pistons do not changeinshape,""sofithat there is no shifting. -of their particle'sandfriction losses are rednced. The pistons approach nearer together,however, by reason of the gradual maintain the? section, but decrease inal that a high degree of compres. m "'is at'taIned at the exit 5.

In Fig. 1 the constriction, of the conduit begins'at the entrance, sothat the quantity of air-entrained between successive water pistons isnot so great as if the conduit were const'antin section'orwere evenincreased. In Fig. 2 is shown a constriction by means of which largerincrements of air can be obtained. Here the side walls 8' of the conduitdiverge from the entrance 3. The successive water pistons 6 inclosealarger volumeof air than would be the case if the sides of the conduitwere to approach each other from the entrance onward; for example,likethedotted lines 9. In order to secure the proper. compression ofthese in the conduit, dividing its outer portion into two sub-conduits,11 11. T e tongue tapers to an edge 12 at its inner end, and the,adjacent surfaces 13 rapidly approach the side walls 8- of the mainconduit until at fthe point 14a suitable narrow cross section isobtained. From this point. to thei'r exits the sub-conduits preservesubstantially the same cross section. It will be observed that eachsub-conduit in Fig. 2 is substantially the same as the single conduitsshown in Fig. 1, so that Fig. 2 may be said to show main conduitsleading to two single or constricted conduits.

patent statutes, 1 have described the principle of operation of myinvention, together with theapparatus whiehl now consider to representthe best embodiment thereof; but I desire to have it understood that theapparatus shown is only illustrative, and that the invention can becarried out by other means.

reduction of their velocity. The gas pistons l larger volumes of air, atongue 10 is inserted In accordance with the provisions of the What Iclaim as newand desire to secure by Letters Patentof the United States,is,

1. In a centrifugal pump in which gases are compr ssed by a specificallyheavier driving medium, a conducting ring provided with conduits whichare tapered from their entrances for a. portion of their length only,

and are substantially straight for the re mainder of theirlength.

2, Ina centrifugal pump in whlch gases are compressed by a specificallyheavier driving-medium,a conducting ring provided with conduitswhosecross'section diminishes ata certain distance from v the entrance.and' thereafter remains substantially constant to' 1tl1e ex it. I

3. In a'pentrifugal pump inwhich gases are compressed by a specifically;heavier driv ng medium, .av conducting ring provided with conduits whoseouter portions are of substantially constant cross section, but

"whose. innerrport-ions'are larger.

4:. In a centrifugal pump in which gases are compressed by aspecifically heavier driving medium, a conducting ring provided withconduits whose cross sect-ion diminishes from the entrancefor a certaindistance and my hand this l5thday of-September, 1908.

- Y' I-IULDREICH KELLER. Witnes'ses:i

' HANsREINEIKE, 'MARTIN KREMP.

Copies of tliis'patentnrajhe obtained-for five cents ,each, byaddressing the Commissioner of Patents,-

Washington, D. 02

